Stapling machine



H. G. ALLEN.

STAPLING MACHINE. APPLICATION FILED was, I921.

130,048 Patented Sept. 26, 1922 if 732Gb 37 :"W" V, O 2%" In we)? 70?saidstapleends up flat against the. matep I innate arm entice. i

nowann e. IALLEBLOF nreeenaranrsninir Yonn. ASSIGNQR To turn a. L.

MORRISON COMPANY, rnc., -or nraeane. rams, new YORK, A' CORPORA- TION OFNEW SIDE/Kr Application filed August 8;

State of New York, have invented new and useful Improvementsin Staplinglvlachines of which the following isa specification. I ".ljhis inventionrelates to a stapling machine for driving U shapedwire staples throughmagazines, boXes,' filled-up bags, l v

below the said bonnet 1O is the foresaid etc, and relates moreparticularly to iniprovements in the type of machine known'as' theclosed head stitcher.

One of the objects of the invention is to produce ;a"s1mple andinexpensivebut reliable means of clenching the staple in such away as tofirst bend the endsofthe staple inwardly by means ofa rotary'niovementof theelenchers and thereafter to compress rial (through which thestaple is being driven) by means of a longitudinal; parallel movement ofsaid 'clenchers. A furtherob-j jecjt of the invention is to produce astapling machine construction in which near 1cmisa fragmentary frontelevation of-the inrproved "stapling machine showing merely a portion'ofthe bonnet or head and a, portion of the clencher mechanism tlmreof witha typical piece of work (such as a magazine) shown therebetween priortothedriving of I p I q p I I "1, the staplestill rests inlits guide 12,and

the staple therethrou-gh. Figure 2is a similar fragmentary elevation butwith the parts in a 'more advanced position and with the staple alreadydrivenlthrough the worleand part ly clenched. Figure is a similar"frag-' mentary elevatiomwith the parts in their final position andwith'the staple completely I clenched. Figure e is atop plan view of theclenching mechanism taken on line ife, Figureb is a vertical,transiverssecs taken on line 55,"Fig. 1. p v

Similar characters of reference refer" to like parts throughout the'severail" views. I In its general organization, this improved staplingmachine comprises theusual bonnet or head 10, which is verticallyslidably mounted in the upper part of the main frame (not shown) ofthemachine, and aclencher.

box 11 which is stationary and is connected tionthrough the saidclenching inechaniisin srArtrne MACHINE.

1921. Serial 1T0. 490,48'?. 1

to the lower'part of the main frame of the machine. Arranged to slidevertically in a" suitable guide 12 of the bonnet '10,) is the usualpower driver 13 which operates to drive the staple 14 out from itsengagement with the aforesaid guide 12 and down "through the horizontalfolds of the maga' zine, box painp'hlet, filled-up bag, or other piece'of work 15 which is being bound together by said staple 14:. Arrangedcentrally clencher box 11 which consistsof rear plates 16,'a front plate17 and a pair of intermedi-x ate spacing plates 19 whose internal edgeshave an irregular comm; all of said plates being suitably retained inproper relation to v each other by-stud pins 20 and securely anddetachably held together by cap screws 21.

Arranged between the front and rear plates 17and 1 6, respectivelys andwithinthe irregular hollow space intermediate of the spacingplatesl9,-are loosely and slidably arranged two companion identically-shaped,flat clenchers'22 of 'bell cran'kor L shaped form. Arranged below. saidclenchers and I vertically slidable within the clencher box or cas'ing11 is a clencher lifter 23' whichis connected by means offalrivet 24:or, other 'wise to a power driven pii'sh'rod-IS, suitably. driven bymeans not shown but in" proper synchronism with the" rest of theinachine', "and "of course, suitably slidably mounted in the lower partofthe of the machine.

main frame In the position of the parts shown in Fig.

the clencher lifter 23 is in its lowermost the outer portions of each ofthe clenchers issupported by reason of the engagement of fthe 'lowerface or edge of its pivot head '26 with theupper edge of a pivot ledge'27 formed in each of thespacing plates 19 The first stapling operationof the machine {is the power-actuated depression of the head or'bonnetflO, and thereafter the power-actuated depression of the driver 13which causes the PU shaped staple 14.1 0 be driven vertically{downwardlywith its two ends 'orlegs extending vertically downwardly below thelower surface of the inaterial 15bcing stapled 'lhe; neXt operation ofthe machine is the power actuated elevation mentioned pivot ledges 27.

and act to center the ends of the staple and operate to bend the sameupwardly and inwardly toward each other to the position;

shown in Fig. This last-mentioned movement of each of the clenchers 22is a rotarymovem'ent about its pivot head 26 as a fulcrum (orapproximate center of rotation) said fulcrum being the co-action betweenthe said pivothead 26 and the companion ledge 27 upon which said headrests. In F ig. 2 the two clenchers 22 are shown with the entire lengthof their upper arms lying fiat upon the upper flat surface or end of theclencher lifter .23. The next movement in the staple driving andclenching operation is a straight, upward movement of'the'ishapedclencher lifter 23, the straight upper arm of each of theclenchers continuing to rest flatly upon the flat upper face or edge ofthe said clencher lifter. Sucha movement is rendered possible by avertically extending clearance notch 38 formed directly above each ofthe afore- In this manner the clenchers 22 are given a directlongitudinally upward movement (not a rotary movement) thereby finallyclenching the legs or ends of the staple 13 flat and. straight upagainst the lower flat face of the material being stapled. In thismannerthe sharp pointed ends of the stapleare positively and firmlydriven up flush into the body of the material being stapled, so thatthere is no danger of said staple points becoming caught in a personsclothing, etc.

The construction of the entire clenching mechanism is such that theactual clenching operation causes the legs of the staple 1a to be firstbent inwardly toward each other and thereafter crushed upwardly with astraight rectilinear motion so that the staple is first properly bentinwardly at the right point and then finally pressed up flat andstraight against and into the lower surface of the material 15. Themechanical posi-v tiveness of this sequence of operations absolutelyprevents the staple. from jamming or clogging' Also the fact that aconsid erable portion of the final clenching operation is a rectilinearmovement of the movingparts means that a considerable variation in thethickness of'the material and a considerable error of verticaladjustment between thebonnet 10 and the clencher box 11 is possiblewithout in any way affecting the angular movement of the clencher 22shaped. clencher lifter 23, whose and hence also the bending operationupon the staple legs. It should particularly be noted also that theclenchers, which are made of flat heat treated stamped sheetmetaldo notrequire any perforationseither to act as bearings or to act as holes forthe reception of the press-fitted pivot studs.

proper shape again after the inevitable warping which occurs upon heattreating the same. The action of the clenchers 22,-

, is absolutely positive both their upward and their downward movementbeing positively actuated by a corresponding movement of the clencherlifter 23. It will furthermore. be noticed in Fig. 1, that the pivothead 26, v

in this position engages with the horizontal shoulder which bounds theupper limit of the clearance notch 33. prevents either one of theclenchers from falling inwardly from the position of Fig.

1, even though one of the clenchers should;

be, frictionally or otherwise held up somewhat above its companionclencher in such a manner that the clenchers do not touch .each'other atall. It should also ,benoticed that, the width of the lower part of the.

width across the extreme upper part of said clencher lifter, so that thesame is absolutely prevented from sliding out of or becoming disengagedfrom the clencher box in the event that the same should be improperlyset up intheclenching machine. In other words, when the clencher partsbecome worn,

This absolutely:

clencher lifter 23 is much less than the the manufacturer of thestapling machine can send out as a complete unit, a clencher box 11together with clenchers 22, plates 19.

and clencher lifter 23 disposed therein without any danger of the partsbecoming dislocated or fallingout of the clencher box.

I claim as my invention:

1. A stapling machine comprising a clencher box having a pair ofsymmetrically disposed pivot ledges, a vertically movable disposedimperforate clenchers each of which is provided on its outer edge with apivot head which is received within and coacts with one of said pivotledges during the .clencherlifter, and a pair of symmetrically firstpart only of the upward movement of said clencher lifter.

2. A stapling machine comprising a clencher box having a pair ofsymmetrically disposed pivot ledges and a pairof clear ance notcheslocated above said pivot ledges, a vertically movable clencher lifterprojecting upwardly into said clencher box, and a pair of imperforateclenchers each of which is provided on its outer edge with a pivot headwhich is received within and coacts with one of said pivot ledges duringthe first part of the upward movement of said clenoher box and traversesthe said clearance notch during the rest of the upward movement of saidclencher box.

3. A stapling machine comprising a clencher box having a pair ofsymmetrically disposed pivot ledges and a pair of clearof hell crankimperforate clenchers each of which is provided with a pivot head whichis adapted to engage with one of the said pivot ledges during the firstpart only of the movement of said clenchers, and each of which has oneof its arms adapted to engage directly with said clencher lifter and itsother arm adapted to engage with the staple being driven.

HOWARD G. ALLEN.

